/*
* jQuery UI Droppable 1.8.7
*
* Copyright 2010, AUTHORS.txt (http://jqueryui.com/about)
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jquery.org/license
*
* http://docs.jquery.com/UI/Droppables
*
* Depends:
*	jquery.ui.core.js
*	jquery.ui.widget.js
*	jquery.ui.mouse.js
*	jquery.ui.draggable.js
*/
(function ($, undefined) {
    $.widget("ui.droppable", {
        widgetEventPrefix: "drop",
        options: {
            accept: '*',
            activeClass: false,
            addClasses: true,
            greedy: false,
            hoverClass: false,
            scope: 'default',
            tolerance: 'intersect'
        },
        _create: function () {
            var o = this.options, accept = o.accept;
            this.isover = 0; this.isout = 1;

            this.accept = $.isFunction(accept) ? accept : function (d) {
                return d.is(accept);
            };

            //Store the droppable's proportions
            this.proportions = { width: this.element[0].offsetWidth, height: this.element[0].offsetHeight };

            // Add the reference and positions to the manager
            $.ui.ddmanager.droppables[o.scope] = $.ui.ddmanager.droppables[o.scope] || [];
            $.ui.ddmanager.droppables[o.scope].push(this);

            (o.addClasses && this.element.addClass("ui-droppable"));
        },

        destroy: function () {
            var drop = $.ui.ddmanager.droppables[this.options.scope];
            for (var i = 0; i < drop.length; i++)
                if (drop[i] == this)
                    drop.splice(i, 1);

            this.element
			.removeClass("ui-droppable ui-droppable-disabled")
			.removeData("droppable")
			.unbind(".droppable");

            return this;
        },

        _setOption: function (key, value) {
            if (key == 'accept') {
                this.accept = $.isFunction(value) ? value : function (d) {
                    return d.is(value);
                };
            }
            $.Widget.prototype._setOption.apply(this, arguments);
        },

        _activate: function (event) {
            var draggable = $.ui.ddmanager.current;
            if (this.options.activeClass) this.element.addClass(this.options.activeClass);
            (draggable && this._trigger('activate', event, this.ui(draggable)));
        },

        _deactivate: function (event) {
            var draggable = $.ui.ddmanager.current;
            if (this.options.activeClass) this.element.removeClass(this.options.activeClass);
            (draggable && this._trigger('deactivate', event, this.ui(draggable)));
        },

        _over: function (event) {
            var draggable = $.ui.ddmanager.current;
            if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element

            if (this.accept.call(this.element[0], (draggable.currentItem || draggable.element))) {
                if (this.options.hoverClass) this.element.addClass(this.options.hoverClass);
                this._trigger('over', event, this.ui(draggable));
            }
        },

        _out: function (event) {
            var draggable = $.ui.ddmanager.current;
            if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element

            if (this.accept.call(this.element[0], (draggable.currentItem || draggable.element))) {
                if (this.options.hoverClass) this.element.removeClass(this.options.hoverClass);
                this._trigger('out', event, this.ui(draggable));
            }
        },

        _drop: function (event, custom) {
            var draggable = custom || $.ui.ddmanager.current;
            if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return false; // Bail if draggable and droppable are same element

            var childrenIntersection = false;
            this.element.find(":data(droppable)").not(".ui-draggable-dragging").each(function () {
                var inst = $.data(this, 'droppable');
                if (
				inst.options.greedy
				&& !inst.options.disabled
				&& inst.options.scope == draggable.options.scope
				&& inst.accept.call(inst.element[0], (draggable.currentItem || draggable.element))
				&& $.ui.intersect(draggable, $.extend(inst, { offset: inst.element.offset() }), inst.options.tolerance)
			) { childrenIntersection = true; return false; }
            });
            if (childrenIntersection) return false;

            if (this.accept.call(this.element[0], (draggable.currentItem || draggable.element))) {
                if (this.options.activeClass) this.element.removeClass(this.options.activeClass);
                if (this.options.hoverClass) this.element.removeClass(this.options.hoverClass);
                this._trigger('drop', event, this.ui(draggable));
                return this.element;
            }

            return false;
        },

        ui: function (c) {
            return {
                draggable: (c.currentItem || c.element),
                helper: c.helper,
                position: c.position,
                offset: c.positionAbs
            };
        }
    });

    $.extend($.ui.droppable, {
        version: "1.8.7"
    });

    $.ui.intersect = function (draggable, droppable, toleranceMode) {
        if (!droppable.offset) return false;

        var x1 = (draggable.positionAbs || draggable.position.absolute).left, x2 = x1 + draggable.helperProportions.width,
		y1 = (draggable.positionAbs || draggable.position.absolute).top, y2 = y1 + draggable.helperProportions.height;
        var l = droppable.offset.left, r = l + droppable.proportions.width,
		t = droppable.offset.top, b = t + droppable.proportions.height;

        switch (toleranceMode) {
            case 'fit':
                return (l <= x1 && x2 <= r
				&& t <= y1 && y2 <= b);
                break;
            case 'intersect':
                return (l < x1 + (draggable.helperProportions.width / 2) // Right Half
				&& x2 - (draggable.helperProportions.width / 2) < r // Left Half
				&& t < y1 + (draggable.helperProportions.height / 2) // Bottom Half
				&& y2 - (draggable.helperProportions.height / 2) < b); // Top Half
                break;
            case 'pointer':
                var draggableLeft = ((draggable.positionAbs || draggable.position.absolute).left + (draggable.clickOffset || draggable.offset.click).left),
				draggableTop = ((draggable.positionAbs || draggable.position.absolute).top + (draggable.clickOffset || draggable.offset.click).top),
				isOver = $.ui.isOver(draggableTop, draggableLeft, t, l, droppable.proportions.height, droppable.proportions.width);
                return isOver;
                break;
            case 'touch':
                return (
					(y1 >= t && y1 <= b) || // Top edge touching
					(y2 >= t && y2 <= b) || // Bottom edge touching
					(y1 < t && y2 > b)		// Surrounded vertically
				) && (
					(x1 >= l && x1 <= r) || // Left edge touching
					(x2 >= l && x2 <= r) || // Right edge touching
					(x1 < l && x2 > r)		// Surrounded horizontally
				);
                break;
            default:
                return false;
                break;
        }
    };

    /*
    This manager tracks offsets of draggables and droppables
    */
    $.ui.ddmanager = {
        current: null,
        droppables: { 'default': [] },
        prepareOffsets: function (t, event) {
            var m = $.ui.ddmanager.droppables[t.options.scope] || [];
            var type = event ? event.type : null; // workaround for #2317
            var list = (t.currentItem || t.element).find(":data(droppable)").andSelf();

            droppablesLoop: for (var i = 0; i < m.length; i++) {
                if (m[i].options.disabled || (t && !m[i].accept.call(m[i].element[0], (t.currentItem || t.element)))) continue; //No disabled and non-accepted
                for (var j = 0; j < list.length; j++) { if (list[j] == m[i].element[0]) { m[i].proportions.height = 0; continue droppablesLoop; } }; //Filter out elements in the current dragged item
                m[i].visible = m[i].element.css("display") != "none"; if (!m[i].visible) continue; 									//If the element is not visible, continue

                m[i].offset = m[i].element.offset();
                m[i].proportions = { width: m[i].element[0].offsetWidth, height: m[i].element[0].offsetHeight };

                if (type == "mousedown") m[i]._activate.call(m[i], event); //Activate the droppable if used directly from draggables
            }
        },
        drop: function (draggable, event) {
            var dropped = false;
            $.each($.ui.ddmanager.droppables[draggable.options.scope] || [], function () {
                if (!this.options) return;
                if (!this.options.disabled && this.visible && $.ui.intersect(draggable, this, this.options.tolerance))
                    dropped = dropped || this._drop.call(this, event);

                if (!this.options.disabled && this.visible && this.accept.call(this.element[0], (draggable.currentItem || draggable.element))) {
                    this.isout = 1; this.isover = 0;
                    this._deactivate.call(this, event);
                }
            });
            return dropped;
        },
        drag: function (draggable, event) {
            //If you have a highly dynamic page, you might try this option. It renders positions every time you move the mouse.
            if (draggable.options.refreshPositions) $.ui.ddmanager.prepareOffsets(draggable, event);

            //Run through all droppables and check their positions based on specific tolerance options
            $.each($.ui.ddmanager.droppables[draggable.options.scope] || [], function () {
                if (this.options.disabled || this.greedyChild || !this.visible) return;
                var intersects = $.ui.intersect(draggable, this, this.options.tolerance);

                var c = !intersects && this.isover == 1 ? 'isout' : (intersects && this.isover == 0 ? 'isover' : null);
                if (!c) return;

                var parentInstance;
                if (this.options.greedy) {
                    var parent = this.element.parents(':data(droppable):eq(0)');
                    if (parent.length) {
                        parentInstance = $.data(parent[0], 'droppable');
                        parentInstance.greedyChild = (c == 'isover' ? 1 : 0);
                    }
                }

                // we just moved into a greedy child
                if (parentInstance && c == 'isover') {
                    parentInstance['isover'] = 0;
                    parentInstance['isout'] = 1;
                    parentInstance._out.call(parentInstance, event);
                }

                this[c] = 1; this[c == 'isout' ? 'isover' : 'isout'] = 0;
                this[c == "isover" ? "_over" : "_out"].call(this, event);

                // we just moved out of a greedy child
                if (parentInstance && c == 'isout') {
                    parentInstance['isout'] = 0;
                    parentInstance['isover'] = 1;
                    parentInstance._over.call(parentInstance, event);
                }
            });
        }
    };
})(jQuery);